|Publication number||US7508103 B2|
|Application number||US 11/343,830|
|Publication date||24 Mar 2009|
|Filing date||31 Jan 2006|
|Priority date||31 Jan 2006|
|Also published as||CA2575415A1, CA2575415C, CN101013832A, EP1814210A2, EP1814210A3, US20070176500|
|Publication number||11343830, 343830, US 7508103 B2, US 7508103B2, US-B2-7508103, US7508103 B2, US7508103B2|
|Inventors||William J. Watkins, Chih M. Lin|
|Original Assignee||A.O. Smith Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (17), Referenced by (2), Classifications (7), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The invention relates to a terminal block that includes terminals and a voltage change device. More specifically, the invention relates to a terminal block that includes terminals and a voltage change device that are tilted with respect to an end cap.
In one embodiment, the invention provides a terminal board for an electric machine having an end cap defining an end plane, a first winding operable at a first voltage, and a second winding operable at a second voltage different from the first voltage. The terminal board includes an attachment portion engageable with the end cap and defining an attachment plane that is substantially parallel to the end plane, and a first terminal portion adapted to receive a first terminal wire. The first terminal portion defines a first terminal plane that intersects the end plane to define an included angle. The included angle is between about 40 degrees and 80 degrees.
In another embodiment, the invention provides a terminal board for an electric machine having an end cap defining an end plane, a first winding operable at a first voltage, and a second winding operable at a second voltage different from the first voltage. The terminal board includes an attachment portion engageable with the end cap and defining an attachment plane that is substantially parallel to the end plane, and a voltage adjustment portion coupled to the attachment portion. A voltage adjustment member is coupled to the voltage adjustment portion and is movable between a first position and a second position to switch the motor from the first winding to the second winding. A lock member is coupled to the voltage adjustment member and is operable to emit an audible sound when the voltage adjustment member is moved from the second position to the first position.
In yet another construction, the invention provides an electric machine including a rotor and a stator having a first winding and a second winding. The rotor is positioned adjacent the stator and is rotatable in response to the application of a voltage to at least one of the first winding and the second winding. The electric machine also includes a housing surrounding at least a portion of the stator and including an end cap that defines an end plane, and a terminal board coupled to the end cap. The terminal board includes a first terminal portion and a second terminal portion. A voltage adjustment portion is formed as part of the terminal board and defines a voltage adjustment plane that is not parallel to the end plane. A voltage adjustment member is coupled to the voltage adjustment portion and is movable between a first position in which the first terminal portion and the second terminal portion are electrically connected to the first winding, and a second position in which the first terminal portion and the second terminal portion are connected to the second winding.
Other aspects and embodiments of the invention will become apparent by consideration of the detailed description and accompanying drawings.
The detailed description particularly refers to the accompanying figures in which:
Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following figures. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms “mounted,” “connected,” “supported,” and “coupled” and variations thereof are used broadly and encompass direct and indirect mountings, connections, supports, and couplings. Further, “connected” and “coupled” are not restricted to physical or mechanical connections or couplings. In addition, where a method, process, or listing of steps is provided, the order in which the method, process, or listing of steps is presented should not be read as limiting the invention in any way.
The end frame 22 includes a recess (not shown) defined by a pair of walls that contact the canopy 24 but provide for access to the shaft 16 without the removal of the canopy 24. The walls are arranged to inhibit the entry of water or other unwanted substances into the space covered by the canopy 24, while allowing for the passage of tools (e.g., wrench, screwdriver, etc.) that can engage the shaft 16 without removing the canopy 24.
As illustrated in
The end frame 22 includes a flat portion 38 and a ventilation portion 40. The flat portion 38 defines a first plane 41, shown in
In the construction shown in
As shown in
As shown in
With continued reference to
The wedge portion 71 includes a U-shaped slot 73, a front wall 271, and a rear wall 273 that cooperates with the front wall 271 to define an oblique angle. The front wall 271 is angled with respect to the end frame 22 such that the grounding screw 75, which is substantially perpendicular to the front wall 271, and the first plane 41 define an oblique angle. The oblique angle 275 is preferably between 40 degrees and 80 degrees, and more preferably is between 40 degrees and 50 degrees.
The rear wall 273 is angled such that it is substantially parallel to the grounding portion 50. The U-shaped slot 73 is sized to receive the grounding screw 75 and can be formed during the casting process. Alternatively, the U-shaped slot 73 is formed during a machining operation that follows casting.
When the terminal board 48 is coupled to the end frame 22, the grounding portion 50 contacts the wedge portion 71. The grounding screw 75 is extended slightly such that the wedge portion 71 is sandwiched between the head of the grounding screw 75 and the grounding portion 50. Thus, when the grounding screw 75 is tightened, it holds a grounding wire in position, at least partially attaches the terminal board 48 to the end frame 22, and provides an electrical path between the grounding wire, the end frame 22, and the grounding portion 50 of the terminal board 48.
In reference to
As better shown in
As shown in
Thus, as can be seen, the same coils 100, 106 and many of the same electrical components are used to define two individual windings 96, 98 in the motor 10. Each arrangement is such that the same voltage is applied across each coil 100, 106, even when different voltages are applied across the first terminal portion 54 and the second terminal portion 56. The particular winding 96, 98 being employed at any given time is determined by the position of the voltage change device 52. Thus, each motor 10 includes at least two windings 96, 98 and the voltage change device 52 selects which of the two windings 96, 98 is energized during motor operation. While each winding 96, 98 shares electrical components that are energized no matter which winding 96, 98 is selected, the different electrical connections make the operation of the windings 96, 98 and thus the windings 96, 98 themselves distinct. Thus, it should be understood that a motor that includes a first winding and a second winding does not require two separate and distinct windings. Rather, all that is required is that the electrical connections within the motor be rearrangeable to define two or more electrically distinct windings.
In the construction shown in
In the construction shown in
Thus, the invention provides, among other things, a new and useful terminal block for an electric machine. The constructions of the terminal block and the methods of manufacturing the terminal block described herein and illustrated in the figures are presented by way of example only and are not intended as a limitation upon the concepts and principles of the invention. Various features and advantages of the invention are set forth in the following claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
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|US6657339||15 Jun 2001||2 Dec 2003||Seagate Technology Llc||Method for setting gaps in hydrodynamic bearings|
|US20040195923||1 Apr 2003||7 Oct 2004||A.O. Smith Corporation||Electric motor having a terminal board|
|DE1057198B||8 Apr 1953||14 May 1959||Siemens Ag||Klemmenbrett fuer Drehstrommotoren|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8678105 *||19 Mar 2009||25 Mar 2014||Robert Bosch Gmbh||Plug arrangement in a machine tool, in particular a handheld machine tool|
|US20110036607 *||19 Mar 2009||17 Feb 2011||Michael Habele||Plug arrangement in a machine tool, in particular a handheld machine tool|
|U.S. Classification||310/71, 318/770, 439/217|
|International Classification||H02K11/00, H01R27/00|
|30 Mar 2006||AS||Assignment|
Owner name: A. O. SMITH CORPORATION, WISCONSIN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WATKINS, WILLIAM J.;LIN, CHIH M.;REEL/FRAME:017389/0741;SIGNING DATES FROM 20060221 TO 20060309
|15 Sep 2011||AS||Assignment|
Effective date: 20110822
Owner name: REGAL BELOIT EPC INC., WISCONSIN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:A. O. SMITH CORPORATION;REEL/FRAME:026913/0714
|24 Sep 2012||FPAY||Fee payment|
Year of fee payment: 4
|7 Jan 2013||AS||Assignment|
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:REGAL BELOIT EPC, INC.;REEL/FRAME:029576/0401
Owner name: RBC MANUFACTURING CORPORATION, WISCONSIN
Effective date: 20121231
|8 Jan 2013||AS||Assignment|
Owner name: REGAL BELOIT AMERICA, INC., WISCONSIN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RBC MANUFACTURING CORPORATION;REEL/FRAME:029582/0236
Effective date: 20121231